Well that wouldn't work well plot wise but remember that Tartarus is much farther underground than Hades' palace is. If you go through the fields of Asphodel you come to a cliff that looks across Tartarus but the cliff is extremely high. Percy and Annabeth would need hiking gear. Plus Hades isn't a fan of them so there's no guarantee he would bother to contact Nico.

If so, tell me what changed, it can be channels or anything.
There's several things that had happened.
- Anthony left from Smosh
- SuperMarioLogan is at risk of losing his channel
- Angry Grandpa deceased
- Etc...

In art class one of the kids told me Samantha called me a retard. She was whispering to her. I just ask weird questions like if Rumpelstiltskin was a number. PS Samantha and the kid that told me sit in front of me.